A.V. Belousov, S.M. Varzar, T.V. Gordienko, A.S. Osipov, A.P. Chernyaev, V.I.Petrov
In work the review of high-energy photon radiation relative biological effectiveness researches is resulted. Computer modeling of photon radiation passage through matter is executed and contributions formed, first of all as a results of photonuclear reactions, various particles in the absorbed dose are defined. Values of photon quality factor, averaged on volume and on penetration depth are calculated.